2 x Sapphire HD 7950's in crossfire on 650 watt PSU

Marko Milanovic · Dec 7, 2014

I am planning on getting 2 HD 7950's for my brothers system, Their TDP is 200 watts and I was wondering if they will be able to run on my brothers set up.

FX 6300
Asrock 970 PRO3
G.SKILL Ripjaws 8GB (2 x 4GB) 2133mhz
1TB seagate 7200rpm HDD
4 200mm fans, 1 140mm fan
2 x Sapphire HD 7950
Planning to get a 650 watt PSU with single 12v rail with 50 amps

I used pcpartpicker to check and it said that the total wattage would be 605 watts but I find it unreliable from past experience

Thanks for your help

prit87 · Dec 7, 2014

A 650 would not be enough in my opinion at least get a good quality 750 watt PSU the 650 watt would run both the cards but it would be very tight.

PCPartPicker part list / Price breakdown by merchant

Power Supply: EVGA 750W 80+ Gold Certified Fully-Modular ATX Power Supply ($89.99 @ NCIX US)
Total: $89.99
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2014-12-07 01:55 EST-0500

A_Goat · Dec 7, 2014

Marko Milanovic :

Ko888 (grand master rating) found this; For a system using two Radeon HD 7950 graphics cards in 2-way CrossFireX mode AMD specifies a minimum of an 700 Watt or greater power supply. The power supply should also have a combined +12 Volt continuous current rating of 46 Amps or greater and have at least four 6-pin PCI Express supplementary power connectors.

So NO, it would not be safe.

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2 x Sapphire HD 7950's in crossfire on 650 watt PSU

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